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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dea90384621ab87f22e70f7ed7f130d14198f6ce93efb06f4ccf2530d945c103' 
  AND token = '6kjwhjYMa4v0D0AI6A+JH0t9yh+p48xlRr3XQvq8ygg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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