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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e4947860b18881bd5cc3ead1ca1d3f43fd787842a85a405c3ffc2ca6f2a4be7' 
  AND token = 'R68eh+zlAj3bJ3cenvNezyGyhozTEkN6Lih3kS4SkR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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