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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3879831275579686fc1283e2e7c6330280874e8ee511d77c0f756e2e211638e' 
  AND token = 'bHh+Dwo67BvFQIBQ3P34DISoD2D9uZzl7vkfGboQq3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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