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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90e0feaa25acab27aecd9e9dce712fbe5779666e150fcf2db2d80d9e899f1159' 
  AND token = '6VFR00/xePYMzCm8hfbo3suuyC3L1+ibyl9q9jD12kU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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