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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b4c8c46a1fecc17dc260e87f1556b77ddc3d357394294674c2f6ac1b1590e74' 
  AND token = '1Tv7oziN3obhcEiqMbzKd/CQ/E+42MCk14biVjbwgVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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