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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e1ed970b7684940951986eee922f21a7421a00082715491811229ecfba72e30' 
  AND token = 'bATHLMCRMWVlBNlF+Ml1ExRY1QKQuGyPSgWdAs7leh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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