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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c4a4f3fd7e4d500c73ebf52bf5efeba9be5624230c8ef06f50b7f785bc4096c' 
  AND token = 'CHHdXQdqVgVaHRbaSl3PwDSzMdv4mm/edEgzsNjcSm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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