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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b826f94943bbbe0d26e25ac9bb108a611f397f6bb53e31736ce2698f59bafb9' 
  AND token = '7Y7MbFG6AEZSllXQz+HZixUCx3u0oi4he0vCEoV88AM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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