SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76966ca4a9248362e695361c1a54826eec7aca180af857bf45a2bb1a7b857362' 
  AND token = 'L3OgzTnjhH/+92X2KVNyhfywJRFxDcNWKNFYCtwPt1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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