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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75aaa699ebd5eb115a0ae1d3fa3264133ceb2b147b942698c402bd52b86f8a79' 
  AND token = 'MgZmj5xOpluipAE4a8NHkTe96oo9VQn3/Fyxqcb6FrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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