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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7bbc0b3d74a051d7fea8124a010af23bd5654301642d830103eefeca1220654' 
  AND token = 'Jjt/EAprex6/iku3ugJRehWCWXJLaxr/qe4YUpUm/PU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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