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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9866b543c6108af4564f9b2466e8f60ceafa81a4f1888dac798804b378d834cd' 
  AND token = '1Gm7BPrOo8YHIRCIxXcsKyFcqlUeaUvjP6zseDv8Ggs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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