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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe8b22f385267c482e378f20b8ef3f0c4708aec21cdaf81019bbb283c4ce7848' 
  AND token = '5wzXJFNbujeDz8OxH2RrIxyb06TGmnLBPlOzZw9sZRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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