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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a26f3fa8043776b24c9538d8315f9b400ddc3152400f0fb04f4bc178418793e0' 
  AND token = 'Pcv8HBn/2i71i8o88LWj5/yhCBCeCtIFVsPLU8oB4e0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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