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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c304b0c418b90723c8f9e755a31069867082894afe97892f1d2983a3b0c6593' 
  AND token = 'irbpCZnfRwsPCV3PojyTAwv4F/Cr0yz1EJKR0D/tzdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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