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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72997c9f6c1ff5a0890803c72a89c98071917792414861b6862c67dc841c7cb2' 
  AND token = 'K5HmRfiP1DXxkXaBowC7fv8LEYdWIJXa1ikDTHNDKJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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