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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68c4c9b699ca9e0eba9582082935a8d8977111736617b1b6c08a11a9af1c86ef' 
  AND token = '2oc0+dt/Btizv/ZQNYJswUn3Lz4/luEegqaENjJe7Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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