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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4979917bc989bae25669a8ddfb03581b19773788b9b9f13b8a70b710e904fec' 
  AND token = 'gX96Ngpfu7NyFoBRBQ9HOFm+0ZH6sDRebfmZkFhhR7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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