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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b90448919737a131c467bb5565f2c2bf0fa6e8a874235369968184b6ae4b6336' 
  AND token = '9bD230ddiL1bSWgQLcpk2suYB7ytCGdGATG1yV/X6wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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