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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32667ad4fedf24b348103405a3753d55dc081b178202f1b2cb94c5b2ec71f95a' 
  AND token = 'ZlsMOutHMUz5nukyksb7dIryL7grGmjaAdg/uJIEykw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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