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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f9fd34d9e04c5b611c79680165c907f4db129b7b5f465c5809ce3547079d02' 
  AND token = '9et/Qj6b9tw7p3Pu18zVYz+8icf/6PzKs4n/o2lV+DY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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