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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0130a77cae2f96926020fa1be95f615d526a42c500223b1406ed915cad52a55' 
  AND token = 'Jmk6Z8Yy5ZN66Q3LKUMk7lV2vYECsHil4CPFOmR3vaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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