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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5509f9d076305efc7114a6de595c04dae9ea76c9b1df6c5a50075a24c42878d0' 
  AND token = 'Kqr+mMLv1yRVZSQuTkBePdWiZRzMhg0c/HVcack/R8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}