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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3caac204a7d3800e6e67e1ed639c6c50150d0594ea6811effeb8ad127397031b' 
  AND token = '7ocU4ASq38mqewSN/Jm5F/CSKyzN4gwlpiaIAWAq+uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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