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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b11d78d6b94697efd82145b791835998fe17c7861962a25b8c61722f49d0824b' 
  AND token = 'yF9b0IYC8cRh0NWI4r5U+FD2pNcu+78Y3CA+Yei2pvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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