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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b331e2e502bc2433642317b6ae51d04f207200a499af863dbf030d15985b750' 
  AND token = '2MOBabtlLwHqGN6VLNDFwRtOBzhywf6OAZOan0CI4jU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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