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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5826e61e6cf1bae954f83425f81e8da496fbd3ea99546300cf91e665f2874e41' 
  AND token = 'BXeyAL7Luit84JjdP/Kf2hXIQidh1dPZAH+jXEUmMXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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