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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1153ade013a69d63e506650202e6788f3c9f57fac7ad649f8af8d4e27803aad' 
  AND token = 'W4z3pIYxoEFydMaRx0qNc4fkfE8drYrrDriX1UQmWro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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