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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '183782a363588866322d49e15b484eaf8becab6b7cfc54ac085e9c6ca8ed5877' 
  AND token = 'fTio6Ogg6AfCG1zXX/W2/jOHn21PaTQhaSi5nK2/NLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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