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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e37e937d96ce8bd8903c82081825959a4ec67a3bb0aba7366d5f4c99b77be122' 
  AND token = '9zlL5iAfnfy04vLq5DMluS23fj3vUL9mq6l+ihxeHuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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