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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20613f30179e38e317eb7e2a1c86527d66c1b7d487eaaae7077d209368e7b661' 
  AND token = 'zL1aJSdk+Em5L6qzxeIdwyFvg2usjWYKDAaClr/IL/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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