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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e7b64de8dc7060f1212b1b1f69fdab46967868169efc7e01f32535f93a89dd1' 
  AND token = 'QLpvQlDLhJ2lF1g1ufm23MUryRfQe3FoVLp/irKmatM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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