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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c52e534f1510127ed9caab2115ebd6e9543e4b30e655a0c81da9972f9cd547f1' 
  AND token = 'HxqVSWrALLkgEC7S2l8X4Zk+sFGNxYuLnX99auP1+ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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