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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb0b7201e9ac0450ee777b2e9593aac48076a375ff0ab3025b3190f2e0cffdce' 
  AND token = 'o9veWh8vJRQIrkJ48r9wD/mPIy8MSvx93ZUTIOo9tkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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