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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '019d0c569935f2c85e49500a8d27cb0ff9ae6b3c1031378fb4082e5eaa1c3135' 
  AND token = 'z8rfRm3FZ2yRg0wkOyTrfcTB/kAsfK0K0io9y+MsVPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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