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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b33e51ea057ecbc2f4e44794fe193e5f8e2de2ba200a7fb8fc5e29d462f5b90f' 
  AND token = 'vInWZ+/Z905c4q4ofW3CLBFsTS1OZ1aVkA7TAmGp2rY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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