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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70071c2c4478ec5dcc6c32182735ec4abb0aec3baeabc2420e1b5d8c7d4f8d79' 
  AND token = '/QuCo9H1MZNIyqOf8ldezL449uONAtsM8ewhMxXNBSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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