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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97e8d969e258a7fd48ce3780e0ad7917b29e3d3cac969d5d14992ebd1a1c9543' 
  AND token = '5ByURRqVLHNqP+L+fnv8bPD/CHEK7tQG4XOFEA2G95s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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