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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f56036917a3ce07b971b9bd27a5d92f030894eb1e8894da4d1dac0bdbcf5eabb' 
  AND token = 'FyRT94Gc4dhVRu3ufLgXl6bbarZAEDmpV+GOKU7H+lU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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