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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f7106f96df4fc913fd006737b0f804a6e353e1e83a403ff885f798745fdd1cc' 
  AND token = '0J/Zb+JwmoWcdZhd/EMHMcArDGZe0H8OZVqOEzDQ4b0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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