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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e9532febad6a88e2130c2a28c149131d5a3ec4004492c3a566e5663db6bea3f' 
  AND token = '5MrutfH3vaxWe2UC/MwwRyy3ok7a4/eTc9FEryyiJQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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