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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '616f818fb56226d86dd9a9f37d31b5a9e165be2e468af01fc0be522bd88c520e' 
  AND token = 'TN//m+8Ax629/tZkdJu3eEJ02bYJEgGTf4b1nYniMxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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