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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b45321170576aaf06ba904b6e0a7701f8643c1cea0832d55839175b5c8998207' 
  AND token = '07j1jX77oIMgqzmT2u3d7hw6LRyAfqWae5Sf1ZuwGbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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