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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fcbbff20e68ba5c4a9592a11ffc339d53ac797b3d6d9c7928f0450d0f85dcc2' 
  AND token = 'iD621CuHChlGEylaBwXd9Uwxwx4n7pxB74NX0zDqAMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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