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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13e3ef8e4fc6749fc05e941bcab6d4ce7d2c4b912f40bde55cc1b44ce7c72b33' 
  AND token = 'dgBwChXrk9xYM3gzBNObhELtNQm7H0VhSjbX9zaFzE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00111

JSON explain

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