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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '963b016dd53e33b1fbf2432b933a486d1cca6a985ee48934dc9e609b9bb2839a' 
  AND token = 'wTY2zCt26J6CK+Oh2DP4GTkrrt0wGfANoeBsbZ3SMJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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