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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed30f11760a6e144feb499d7ba5c05cc04ab242d518d19f99de6c7244873ef11' 
  AND token = 'F2RPsl3ZGaDPYsD4dD0645Rv2KTKtk2k+SByReAAPoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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