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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ba3d20be38fb25e87b1f6ff8446687a56f6fb3e3e23a505d441ca39c752a991' 
  AND token = 'Oua+Z5sXI64FHRycv33pHT8jykUhcm2Yz/867NBdA9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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