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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45f4cdd42876154f2c125abb0a793e53f9389d8a95bed0ceaa4f44a123651d60' 
  AND token = 'drZ59lqoymYeIYN3Zhtcr7aI955tihZ1Oi8s7atADAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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