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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17c2eb35dd0d248bb2988f0b2dc870357db2f2cf29cc4f54671ca164cfdc4187' 
  AND token = 'tM7u3RwqFRIJMcHL3ri6vglL22JBjrQdgWDMFfZoYxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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