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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63eb3f2b0bae3bce6cedbae1ceae3d36ae301dda505067709c4349746da59fec' 
  AND token = 'b145THr9f+8DoxauH10GExr0JcGI8nqPuP9ogPp8lzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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