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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c20223b823612a3988404319b0d2e96dddd676fddd9e25caf7b742118ba6de1' 
  AND token = '7gcB/JXf8A0MFOLU/RFgKjRQoIG3t43g2R0w1E0yT1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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