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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf0aab1d4572222bbb0a2e65af2999f8eefebd7517d3090248c53b868b45ddb0' 
  AND token = 'dFWQOzdLHv+B45W/UL/yPdMbN19p9OhlSuANyu0qb3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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