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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98f05dfde65249022006cd4f3e40291f057ad5608a8dac6e565ab3e1e67b1c14' 
  AND token = 'CqsKOlnwC0HQVujfoZ6oV9nd5Ajomv7iuK/lshJVdM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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