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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dc4bdf0c8cd199c9cf8dedde46c26f64c8c57f598fa3d2612b8db729098854f' 
  AND token = 'b8r5RrIJ/+gXJDxT6ucqtZK4XyXUXTdN6GRlhP5Af3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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