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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00e38c9b5794f98e8b1a5a26fefea874f76c3449914ad586f3853724b2b9cd7a' 
  AND token = 's7YoAXlbyasdK0tIdWWufBMIGwPsk7g2fRSEENu7C9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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