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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c37725c48a65090ff95e79973310965c9c167f6af4bd8e30c451ddf319c6df97' 
  AND token = '0qN0wvlL04I7pwbw5/P3X1cJKCjWvUm2bF8mWq1rFkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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