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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c73c528caed9727029a2454fa6c5bb454491efd9bc1c6457fafb976f98b307f4' 
  AND token = 'zE/fKYkcWeFKJnF8Yx+APV5c9lcW1DzjURa+f0l8FvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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