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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e873efe03290b22d8d46870ee9f29f2d2397057f9cc1d04eb0a9610c25edcd3' 
  AND token = 'YGtBZG89KR5ip8c5rBI5C7lyMGroxZRW75zBFSOzDGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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