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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37263a76ef202f690c52cf6fb23723d327d4a76b04691422341a906f5af4aa02' 
  AND token = 'PtNQbHmXElrXmKFG2hQL+ubNpN9aSMdvEdtmNB8BavI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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