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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9214ed9462c07888f3f0ca973bd15a6ed6cb08582a49ea06411a96f2f02bc6a' 
  AND token = 'U/F8Eb7Epk5H1oBskLGygIKCvT+iqcD+vDdn2ZQASbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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